CN218412991U - Distributed optical fiber leakage monitoring device based on strain - Google Patents
Distributed optical fiber leakage monitoring device based on strain Download PDFInfo
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- CN218412991U CN218412991U CN202222683900.3U CN202222683900U CN218412991U CN 218412991 U CN218412991 U CN 218412991U CN 202222683900 U CN202222683900 U CN 202222683900U CN 218412991 U CN218412991 U CN 218412991U
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Abstract
The utility model discloses a distributed optical fiber leakage monitoring device based on meet an emergency, including distributed leakage sensing optical cable, distributed leakage sensing optical cable includes that from interior to exterior sets gradually first fibre core, inlayer sheath, elastic sheath, expansion band and nylon weave. The utility model discloses in, carry out the cable formula encapsulation to the fibre core, adopt full non-metallic structure design, optical signal transmission, the optical cable need not the power supply, very big promotion the reliability and the long-term stability of monitoring, no potential safety hazard, when leaking liquid contact distributing type seepage sensing optical cable, utilize the water swelling's of expansion zone material characteristic, drive the axial compression of fibre core, the optical cable produces and warp, realize the seepage monitoring of full temperature liquid medium through monitoring strain parameter, do not rely on the temperature difference, can realize the seepage monitoring of the full length of tunnel through a distributing type seepage sensing optical cable, open cut tunnel and open and/or have higher popularization and application and worth in piping lane installation pipeline seepage monitoring under water.
Description
Technical Field
The utility model belongs to the technical field of the optical fiber monitoring, concretely relates to distributed optical fiber leakage monitoring device based on meet an emergency.
Background
In recent years, with the rapid development of national economy and the advance of urbanization process, the construction of the traffic infrastructure of China has been advanced sufficiently and developed vigorously, and the situation that the quantity of projects is increased day by day and the construction scale is enlarged continuously is presented. Tunnel engineering and pipeline engineering are important components of urban construction. However, the tunnels and pipes are usually special structures built in the stratum rock (soil), there are a lot of hidden projects, and the complexity of geological and hydrological conditions and the variability of the operating environment cause various problems in the operation process of the tunnels and pipes, wherein the tunnel leakage water is the most serious, and the theory of "ten tunnels and nine leaks" is often used. The leakage water brings adverse effects to the normal service of the structure and the like, and even seriously threatens the operation stability and safety of the tunnel and the pipeline.
The optical fiber sensing technology can carry out distributed monitoring, has the advantages of no electromagnetic interference, good stability, high monitoring precision and the like, and has the advantages of relatively small weight, easy installation, no damage to a measuring object, high working safety performance, wide monitoring range and the like when the leakage water is detected; in addition, the system can monitor and process data remotely, and is convenient for large-scale management and emergency early warning and diagnosis processing under the environment of the Internet of things system. As a neotype monitoring technology, be applied to the tunnel at present, the pipeline seepage is mainly based on distributed temperature sensing technique, realize the seepage incident through temperature anomaly promptly and survey, but above-mentioned mode only is applicable to the occasion that seepage liquid temperature and ambient temperature have certain difference in temperature, the chinese utility model patent, application number 201820071790.9 discloses a distributed temperature measurement optical cable for pipeline leakage monitoring, a sensing optical cable structure based on temperature difference realizes the pipeline seepage is proposed, this optical cable is the loose cover structure, the isolation is met an emergency and is only sensitive to the temperature, its problem lies in if intraductal medium temperature is unanimous with ambient temperature, then can't realize leakage monitoring. When liquid temperature and ambient temperature are close, also have the mode of heating through carrying out the optical cable to realize the seepage monitoring at present, the utility model discloses a china utility model patent, application number 2013103977.1 discloses a ground body seepage rate distributed monitoring method and system, a temperature sensing optical cable with internal heating function is proposed, realize ground body seepage speed monitoring through the heating, monitoring has certain reference to normal atmospheric temperature medium leakage, however, the problem of above-mentioned mode lies in being difficult to realize the long distance heating, and the tunnel, usually not allow power supply heating in the pipeline, there is the conflagration, potential safety hazards such as explosion.
SUMMERY OF THE UTILITY MODEL
For solving among the prior art based on the technical problem that distributed temperature sensing technique carries out leak detection and exists, the utility model aims to provide a distributed optic fibre seepage monitoring devices based on meet an emergency.
In order to realize the purpose, the technical effect is achieved, the utility model adopts the technical scheme that:
the utility model discloses a distributed optical fiber leakage monitoring devices based on meet an emergency, including distributed leakage sensing optical cable, distributed leakage sensing optical cable includes that from interior to exterior sets gradually first fibre core, inlayer sheath, elastic sheath, expansion band and nylon weave.
Further, a second fiber core is spirally wound outside the elastic sheath.
Furthermore, an inner layer sheath is sleeved in the center of the elastic sheath, and the inner layer sheath is connected with the elastic sheath through an adhesive.
Furthermore, the expansion belt is formed by weaving a plurality of water-blocking yarns in a strip shape, and is tightly wound on the outer side of the elastic sheath; the nylon weaving is formed by weaving a plurality of nylon wires, and the nylon weaving is loosely wrapped with the expansion band.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a distributed optical fiber leakage monitoring device based on meet an emergency, including distributed leakage sensing optical cable, distributed leakage sensing optical cable includes that from interior to exterior sets gradually first fibre core, inlayer sheath, elastic sheath, expansion band and nylon weave. The utility model provides a distributed optical fiber leakage monitoring device based on strain, carry out cable formula encapsulation to the fibre core, no mechanical structure, very big promotion the reliability and the long-term stability of monitoring; the optical cable is not required to be powered, so that the safety of application in relatively closed tunnels, pipelines and the like can be guaranteed, and potential safety hazards are avoided; by utilizing the characteristic that the material of the expansion belt expands when meeting water, when leakage liquid contacts the distributed leakage sensing optical cable, the expansion belt rapidly expands in the circumferential direction after absorbing water to drive the axial compression of the fiber core, the optical cable deforms, the leakage monitoring of the full-temperature liquid medium is realized by monitoring strain parameters (such as strain change rate) without depending on temperature difference, the sensitivity is high, the test result is more accurate, and the limitation that the leakage of the normal-temperature medium cannot be identified by the conventional monitoring mode based on the temperature difference is overcome; the judgment of the leakage event is carried out based on a strain mode, so that the early warning accuracy of the leakage event is improved, and the false alarm rate is greatly reduced; by additionally arranging the fiber core in the spiral arrangement, the spatial resolution capability of leakage monitoring is greatly improved, and the level is improved from m to mm; the leakage monitoring of the whole length of the tunnel can be realized through one distributed leakage sensing optical cable, and the distributed leakage sensing optical cable has higher popularization and application values in leakage monitoring of underwater open cut tunnels and open-air and/or pipe gallery installation pipelines.
Drawings
Fig. 1 is a schematic structural diagram of a distributed leakage sensing optical cable according to the present invention; FIG. 1a is a front view of a distributed leak sensing optical cable; FIG. 1b is a side view of a distributed leak sensing optical cable;
fig. 2 is a schematic diagram illustrating the layout of the strain-based distributed optical fiber leakage monitoring device in an underwater open-cut tunnel according to the present invention;
fig. 3 is a schematic layout view of an open seam water stop structure of an underwater open-cut tunnel according to the strain-based distributed optical fiber leakage monitoring device of the present invention;
fig. 4 is a schematic layout diagram of the omega water stop structure of the strain-based distributed optical fiber leakage monitoring device in an underwater open-cut tunnel according to the present invention;
fig. 5 is a schematic diagram of the layout of the strain-based distributed optical fiber leakage monitoring device of the present invention in an open air or in a pipe gallery installation pipeline; FIG. 5a is a layout diagram of a first mode, FIG. 5b is a layout diagram of a second mode, and FIG. 5c is a layout diagram of a third mode;
fig. 6 is a graph of leakage monitoring curve of the strain-based distributed optical fiber leakage monitoring device of the present invention; fig. 6a is a strain-length plot and fig. 6b is a strain-time plot.
Detailed Description
The present invention is described in detail below, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making more clear and definite definitions of the protection scope of the present invention.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
The utility model discloses a distributed optic fibre seepage monitoring devices based on meet an emergency, as shown in fig. 1, the device includes distributed seepage sensing optical cable 21, distributed seepage sensing optical cable 21 includes first fibre core 11, inlayer sheath 12, elastic sheath 13, second fibre core 15, 17 is woven to inflation area 16 and nylon, the outer parcel inlayer sheath 12 of first fibre core 11, inlayer sheath 12 overcoat elastic sheath 13, the outer spiral winding second fibre core 15 of elastic sheath 13, the design can be customized to the spiral interval, 16 parcels in elastic sheath 13 and second fibre core 15 outsidely of inflation area, 17 loose parcels in 16 outsidess of inflation area are woven to nylon, inflation area 16 has better water-swelling's characteristic, cause the optical cable to warp based on 16 expansions in inflation area, through monitoring the parameter of meeting an emergency, realize the seepage monitoring of full temperature liquid medium.
In the utility model, the first fiber core 11 and the inner layer sheath 12 are in full contact tight-wrapping connection and can be deformed cooperatively; the elastic sheath 13 is an elastic low-smoke halogen-free sheath and has better elasticity, the inner sheath 12 is sleeved in the center of the elastic sheath 13, the elastic sheath 13 and the inner sheath 12 are coupled through a bonding agent to form a fixed point 14 according to a fixed distance, and the other positions are not contacted; the expansion belt 16 is formed by weaving a plurality of water-blocking yarns in a strip shape and is tightly wound on the outer side of the second fiber core 15; the nylon braid 17 is braided with a plurality of nylon filaments.
The first core 11 may be a fully distributed strained core or a densely distributed (weak fiber grating) core.
The second core 15 may be a fully distributed strained core or a densely distributed (weak fiber grating) core. The second core 15 may or may not be used to improve the spatial resolution of the leakage detection.
As shown in fig. 2-6, the utility model also discloses an application of distribution type optic fibre seepage monitoring devices based on meeting an emergency as above in open cut tunnel under water and open air and/or piping lane installation pipeline seepage monitoring.
An application method of a distributed optical fiber leakage monitoring device based on strain in leakage monitoring of an underwater open-cut tunnel comprises the following steps:
distributing the distributed leakage sensing optical cable 21 along the seam 22 of the underwater open-cut tunnel by using a matched clamp, fully covering the seam path, transiting and routing along the side wall of the tunnel after each seam is distributed, and distributing the next seam 22; all the distributed leakage sensing optical cables 21 are connected with the matched distributed strain demodulation equipment, leakage liquid causes deformation of the distributed leakage sensing optical cables 21, strain data are obtained through the distributed strain demodulation equipment and transmitted to the distributed strain demodulation equipment for processing, and leakage monitoring of the whole length of the tunnel is achieved through one distributed leakage sensing optical cable 21.
When laying, anchor clamps are according to seam stagnant water structure selection:
for the open seam water stop structure, the distributed leakage sensing optical cable 21 is installed in the seam by using the concave clamp 31, the concave clamp 31 is fastened at the seam by a plurality of rivets 32, the fixed distance is 1-2m, and the distributed leakage sensing optical cable 21 can be ensured to be fully contacted with the leakage water body, as shown in fig. 3.
For the omega water stop structure 33, the distributed leakage sensing optical cable 21 is mounted at the joint of the omega water stop structure 33 and the tunnel wall by using a folding clamp 34, the joints at two sides are covered, the distributed leakage sensing optical cable is fixed by using a bonding agent, the fixed distance is 1-2m, and the distributed leakage sensing optical cable 21 is ensured to be tightly attached to the wall, as shown in fig. 4.
The application method of the strain-based distributed optical fiber leakage monitoring device in outdoor and/or pipe gallery installation pipeline leakage monitoring comprises the following steps:
the distributed leakage sensing optical cable 21 is axially arranged along the pipeline 42 to be tested, and is usually arranged at the bottom of the pipeline 42 to be tested, so that the following water collection modes can be adopted to ensure that leakage liquid can be collected to the position of the distributed leakage sensing optical cable 21;
in the first mode, a water collecting tank 43 is installed at the bottom of the pipeline 42 to be measured, the distributed leakage sensing optical cable 21 is placed in the water collecting tank 43, and after liquid leaks or leaks, the liquid is collected to the water collecting tank 43 along the pipe wall of the pipeline 42 to be measured, so that the distributed leakage sensing optical cable 21 is deformed, as shown in fig. 5 a;
in the second mode, a double-layer tube mode is adopted, an outer tube 44 with a slightly larger diameter is arranged on the outer ring of the to-be-detected tube 42, the distributed leakage sensing optical cable 21 is placed at the bottom in the outer tube 44, and leakage liquid is collected to the bottom in the outer tube 44, so that the distributed leakage sensing optical cable 21 is deformed, as shown in fig. 5 b;
in a third mode, a layer of heat-shrinkable belt 45 is wrapped outside the pipeline 42 to be measured, the distributed leakage sensing optical cable 21 is placed at the bottom in the heat-shrinkable belt 45, and the leakage liquid is transported to the bottom in the heat-shrinkable belt 45, so that the distributed leakage sensing optical cable 21 is deformed, as shown in fig. 5 c.
Example 1
As shown in fig. 1-4 and fig. 6, a distributed optical fiber leakage monitoring device based on strain comprises a distributed leakage sensing optical cable 21, wherein the distributed leakage sensing optical cable 21 comprises a first fiber core 11, an inner sheath 12, an elastic sheath 13, a second fiber core 15, an expansion band 16 and a nylon braid 17, the inner sheath 12 is wrapped outside the first fiber core 11, the elastic sheath 13 is wrapped outside the inner sheath 12, the second fiber core 15 is spirally wound outside the elastic sheath 13, the spiral pitch can be customized, the expansion band 16 is wrapped outside the elastic sheath 13 and the second fiber core 15, the nylon braid 17 is loosely wrapped outside the expansion band 16, the expansion band 16 has good water-swelling characteristics, the optical cable deforms based on the expansion of the expansion band 16, and leakage monitoring of a liquid medium at full temperature is realized by monitoring strain parameters.
The first fiber core 11 and the inner layer sheath 12 are in full-contact tight-wrapping connection and can be deformed cooperatively; the elastic sheath 13 is an elastic low-smoke halogen-free sheath and has better elasticity, the inner sheath 12 is sleeved in the center of the elastic sheath 13, the elastic sheath 13 and the inner sheath 12 are coupled through a bonding agent to form a fixed point 14 according to a fixed distance, and the other positions are not contacted; the expansion belt 16 is formed by weaving a plurality of water-blocking yarns in a strip shape and is tightly wound on the outer side of the second fiber core 15; the nylon braid 17 is braided with a plurality of nylon filaments.
The first core 11 is a fully distributed strained core. The second fiber core 15 is a fully distributed strain fiber core, and the second fiber core 15 is used for improving the spatial resolution of leakage monitoring.
The embodiment discloses application of a strain-based distributed optical fiber leakage monitoring device in leakage monitoring of an underwater open-cut tunnel.
An application method of a distributed optical fiber leakage monitoring device based on strain in leakage monitoring of an underwater open-cut tunnel comprises the following steps:
distributing the distributed leakage sensing optical cable 21 along the seam 22 of the underwater open cut tunnel by adopting a matched clamp, fully covering the seam path, transitionally routing along the side wall of the tunnel after each seam is distributed, and distributing the next seam 22; all the distributed leakage sensing optical cables 21 are connected with the matched distributed strain demodulation equipment, leakage liquid causes deformation of the distributed leakage sensing optical cables 21, strain data are obtained through the distributed strain demodulation equipment and transmitted to the distributed strain demodulation equipment for processing, and leakage monitoring of the whole length of the tunnel is achieved through one distributed leakage sensing optical cable 21.
When laying, anchor clamps are according to seam stagnant water structure selection:
for the open seam water stop structure, the distributed leakage sensing optical cable 21 is installed in the seam by using the concave clamp 31, the concave clamp 31 is fastened at the seam through a plurality of rivets 32, the width of the concave clamp 31 is 2cm, and the fixed distance is 1-2m, so that the distributed leakage sensing optical cable 21 can be fully contacted with the leakage water body, as shown in fig. 3.
For the omega water stop structure 33, the distributed leakage sensing optical cable 21 is installed at the seam between the omega water stop structure 33 and the tunnel wall by adopting a folding clamp 34, the seams at two sides are covered and fixed by using an adhesive, the width of the folding clamp 34 is 2cm, the fixed distance is 1-2m, and the distributed leakage sensing optical cable 21 is ensured to be tightly attached to the wall, as shown in fig. 4.
After the leakage liquid contacts the expansion band 16 of the distributed leakage sensing optical cable 21, the expansion band 16 absorbs water and then rapidly expands in the circumferential direction, and because the elastic sheath 13 has better elasticity, when the expansion band 16 expands, the fiber core of the distributed leakage sensing optical cable 21 is driven to compress in the axial direction, the strain between two fixed points of the optical cable is reduced, as shown in fig. 6a, the leakage judgment is realized according to the average strain change rate between the fixed points, as shown in fig. 6b, and can be defined as-500 mu epsilon/10 min, namely, the strain is reduced by more than 500 mu epsilon within 10 min.
Example 2
As shown in fig. 1 and 5, a distributed optical fiber leakage monitoring device based on strain comprises a distributed leakage sensing optical cable 21, wherein the distributed leakage sensing optical cable 21 comprises a first fiber core 11, an inner layer sheath 12, an elastic sheath 13, a second fiber core 15, an expansion band 16 and a nylon braid 17, the inner layer sheath 12 is wrapped outside the first fiber core 11, the elastic sheath 13 is wrapped outside the inner layer sheath 12, the second fiber core 15 is spirally wound outside the elastic sheath 13, the spiral distance can be customized, the expansion band 16 is wrapped outside the elastic sheath 13 and the second fiber core 15, the nylon braid 17 is loosely wrapped outside the expansion band 16, the expansion band 16 has a good characteristic of water swelling, the optical cable deforms based on the expansion of the expansion band 16, and leakage monitoring of a full-temperature liquid medium is realized by monitoring strain parameters.
In the utility model, the first fiber core 11 and the inner layer sheath 12 are in full contact tight-wrapping connection and can be deformed cooperatively; the elastic sheath 13 is an elastic low-smoke halogen-free sheath and has better elasticity, the inner sheath 12 is sleeved in the center of the elastic sheath 13, the elastic sheath 13 and the inner sheath 12 are coupled through a bonding agent to form a fixed point 14 according to a fixed distance, and the other positions are not contacted; the expansion belt 16 is formed by weaving a plurality of water-blocking yarns in a strip shape and is tightly wound on the outer side of the second fiber core 15; the nylon braid 17 is braided with a plurality of nylon filaments.
The first fiber core 11 is a fully distributed strain fiber core, the second fiber core 15 is a fully distributed strain fiber core, and the second fiber core 15 is used for improving the spatial resolution of leakage monitoring.
Use of a strain-based distributed optical fibre leak monitoring device for leak monitoring of open air and/or installation piping in a pipe gallery.
An application method of a strain-based distributed optical fiber leakage monitoring device in leakage monitoring of outdoor or pipe gallery installation pipelines comprises the following steps:
the distributed leakage sensing optical cable 21 is axially arranged along the pipeline 42 to be tested, and is usually arranged at the bottom of the pipeline 42 to be tested, and in order to ensure that leakage liquid can be collected to the position where the distributed leakage sensing optical cable 21 is located, the following various water collecting modes can be adopted;
in the first mode, a water collecting tank 43 is installed at the bottom of the pipeline 42 to be measured, the distributed leakage sensing optical cable 21 is placed in the water collecting tank 43, and after liquid leaks or leaks, the liquid is collected to the water collecting tank 43 along the pipe wall of the pipeline 42 to be measured, so that the distributed leakage sensing optical cable 21 is deformed, as shown in fig. 5 a;
in the second mode, a double-layer tube mode is adopted, an outer tube 44 with a slightly larger diameter is arranged on the outer ring of the to-be-detected tube 42, the distributed leakage sensing optical cable 21 is placed at the bottom in the outer tube 44, and leakage liquid is collected to the bottom in the outer tube 44, so that the distributed leakage sensing optical cable 21 is deformed, as shown in fig. 5 b;
in a third mode, a layer of heat-shrinkable tape 45 is wrapped outside the pipeline 42 to be tested, the distributed leakage sensing optical cable 21 is placed at the bottom in the heat-shrinkable tape 45, and the leakage liquid is transported to the bottom in the heat-shrinkable tape 45, so that the distributed leakage sensing optical cable 21 is deformed, as shown in fig. 5 c.
The same as in example 1.
The utility model discloses the part or the structure that do not specifically describe adopt prior art or current product can, do not do here and describe repeatedly.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all utilize the equivalent structure or equivalent flow transformation that the content of the specification does, or directly or indirectly use in other related technical fields, all including in the same way the patent protection scope of the present invention.
Claims (4)
1. The distributed optical fiber leakage monitoring device based on strain is characterized by comprising a distributed leakage sensing optical cable, wherein the distributed leakage sensing optical cable comprises a first fiber core, an inner layer sheath, an elastic sheath, an expansion band and nylon weaves, which are sequentially arranged from inside to outside.
2. The strain-based distributed fiber optic leak monitor device according to claim 1, wherein the elastic sheath is helically wound with a second core.
3. The strain-based distributed optical fiber leakage monitoring device according to claim 1, wherein the elastic sheath is sleeved with an inner sheath, and the inner sheath and the elastic sheath are connected together through an adhesive.
4. The strain-based distributed optical fiber leakage monitoring device according to claim 1, wherein the expansion tape is formed by weaving a plurality of water-blocking yarns in a strip shape, and the expansion tape is tightly wound outside the elastic sheath; the nylon weaving is formed by weaving a plurality of nylon wires, and the nylon weaving is loosely wrapped with the expansion band.
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| CN202222683900.3U CN218412991U (en) | 2022-10-12 | 2022-10-12 | Distributed optical fiber leakage monitoring device based on strain |
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